Deadhead return control system for a locomotive or a control car similar to a locomotive

Abstract

A deadhead return control system for a locomotive or a control car similar to a locomotive having a deadhead stop and a piston valve with the connection status of the piston valve being controlled by the status of the deadhead stop. A first end of the deadhead stop is connected to a pilot end of the piston valve, a second end of the deadhead stop is connected to the atmosphere, a third end of the deadhead stop is connected to the external main air pipe. When the deadhead stop has a closed status, the first end of the stop is connected to the second end of the stop and when the stop has an open status, the first end of the stop is connected to the third end of the stop to allow for the air from said main air pipe to flow into the piston valve.

What is claimed is: 
     
       1. A deadhead return control system for a locomotive or a control car similar to a locomotive, comprising:
 a deadhead stop having an open status and a closed status, the opening and closing of said deadhead stop corresponding respectively to a deadhead return mode and a normal operating mode of a locomotive or a control car similar to a locomotive; 
 a piston valve interconnected to said deadhead stop, the connection status of said piston valve being controlled by the open or closed status of said deadhead stop; 
 a first end of said deadhead stop is connected to a pilot end of said piston valve; 
 a second end of said deadhead stop is connected to atmosphere; 
 a third end of said deadhead stop is connected to an external main air pipe; 
 when said deadhead stop is at the closed status, said first end of said deadhead stop is connected to said second end of said deadhead stop; and 
 when said deadhead stop is at the open status, said first end of said deadhead stop is connected to said third end of said deadhead stop to allow air from said main air pipe to flow into said piston valve. 
 
     
     
       2. The deadhead return control system of  claim 1 , further comprising a one-way valve having an inlet end connected to an external brake pipe and an outlet end connected to an external main air pipe. 
     
     
       3. The deadhead return control system of  claim 2 , further comprising a plurality of serially connected one-way valves. 
     
     
       4. The deadhead return control system of  claim 2 , wherein said outlet end of said one-way valve is also connected to an external parking brake cylinder. 
     
     
       5. The deadhead return control system of  claim 1 , wherein a first end of said piston valve is directly connected to an external parking brake cylinder, a second end of said first piston valve is connected to an external parking brake cylinder pipe or brake cylinder, a third end of said first piston valve is connected to a component, which is connected to said parking brake cylinder;
 wherein when said deadhead stop is at the closed status, said second end of said piston valve is connected to said third end of said piston valve, and when said deadhead stop is at the open status, said second end of said piston valve is connected to said first end of said piston valve. 
 
     
     
       6. The deadhead return control system of  claim 5 , further comprising a two-way check valve, wherein a first inlet end of said two-way check valve is connected to an external brake cylinder, an outlet end is connected to an external parking brake cylinder pipe, and a second inlet end is connected with the second end of said first piston valve. 
     
     
       7. The deadhead return control system of  claim 5 , wherein said third end of said piston valve is connected to a pulse solenoid valve, and said pulse solenoid valve is connected to said parking brake cylinder via a throttle and a pressure reducing valve. 
     
     
       8. The deadhead return control system of  claim 1 , further comprising:
 a second piston valve wherein a first end of said second piston valve is connected to an input end of an external brake cylinder pressure pre-control pipe via a pressure reducing apparatus, a second end of said second piston valve is directly connected to an input end of said external brake cylinder pressure pre-control pipe, and a third end of said second piston valve is connected to an output end of said external brake cylinder pressure pre-control pipe; 
 wherein when said deadhead stop is at the closed status, said second end of said second piston valve is connected to said third end of said second piston valve; 
 wherein when said deadhead stop is at the open status, said first end of said second piston valve is connected to said third end of said second piston valve. 
 
     
     
       9. The deadhead return control system of  claim 1 , further comprising:
 a third piston valve wherein a first end of said third piston valve is connected to the atmosphere, a second end of said third piston valve is directly connected to an external brake cylinder, and a third end of said third piston valve is connected to an external brake cylinder pilot pipe; 
 wherein when said deadhead stop is at the closed status, said third end of said third piston valve is connected to said second end of said third piston valve; 
 wherein when said deadhead stop is at the open status, said third end of said third piston valve is connected to said first end of said third piston valve. 
 
     
     
       10. A locomotive or a control car similar to a locomotive, comprising:
 a deadhead return control system including 
 a deadhead stop having an open status and a closed status, the opening and closing of said deadhead stop corresponding respectively to a deadhead return mode and a normal operating mode of a locomotive or a control car similar to a locomotive; 
 a piston valve interconnected to said deadhead stop, the connection status of said piston valve being controlled by the open or closed status of said deadhead stop; 
 a first end of said deadhead stop is connected to a pilot end of said piston valve; 
 a second end of said deadhead stop is connected to atmosphere; 
 a third end of said deadhead stop is connected to an external main air pipe; 
 when said deadhead stop is at the closed status, said first end of said deadhead stop is connected to said second end of said deadhead stop; and 
 when said deadhead stop is at the open status, said first end of said deadhead stop is connected to said third end of said deadhead stop to allow air from said main air pipe to flow into said piston valve. 
 
     
     
       11. The deadhead return control system of  claim 10 , further comprising a one-way valve having an inlet end connected to an external brake pipe and an outlet end connected to an external main air pipe. 
     
     
       12. The deadhead return control system of  claim 11 , further comprising a plurality of serially connected one-way valves. 
     
     
       13. The deadhead return control system of  claim 11 , wherein said outlet end of said one-way valve is also connected to an external parking brake cylinder. 
     
     
       14. The deadhead return control system of  claim 10 , wherein a first end of said piston valve is directly connected to an external parking brake cylinder, a second end of said first piston valve is connected to an external parking brake cylinder pipe or brake cylinder, a third end of said first piston valve is connected to a component, which is connected to said parking brake cylinder;
 wherein when said deadhead stop is at the closed status, said second end of said piston valve is connected to said third end of said piston valve, and when said deadhead stop is at the open status, said second end of said piston valve is connected to said first end of said piston valve. 
 
     
     
       15. The deadhead return control system of  claim 14 , further comprising a two-way check valve, wherein a first inlet end of said two-way check valve is connected to an external brake cylinder, an outlet end is connected to an external parking brake cylinder pipe, and a second inlet end is connected with the second end of said first piston valve. 
     
     
       16. The deadhead return control system of  claim 14 , wherein said third end of said piston valve is connected to a pulse solenoid valve, and said pulse solenoid valve is connected to said parking brake cylinder via a throttle and a pressure reducing valve. 
     
     
       17. The deadhead return control system of  claim 10 , further comprising:
 a second piston valve, wherein a first end of said second piston valve is connected to an input end of an external brake cylinder pressure pre-control pipe via a pressure reducing apparatus, a second end of said second piston valve is directly connected to an input end of said external brake cylinder pressure pre-control pipe, and a third end of said second piston valve is connected to an output end of said external brake cylinder pressure pre-control pipe; 
 wherein when said deadhead stop is at the closed status, said second end of said second piston valve is connected to said third end of said second piston valve; 
 wherein when said deadhead stop is at the open status, said first end of said second piston valve is connected to said third end of said second piston valve. 
 
     
     
       18. The deadhead return control system of  claim 17 , further comprising:
 a third piston valve wherein a first end of said third piston valve is connected to the atmosphere, a second end of said third piston valve is directly connected to an external brake cylinder, and a third end of said third piston valve is connected to an external brake cylinder pilot pipe; 
 wherein when said deadhead stop is at the closed status, said third end of said third piston valve is connected to said second end of said third piston valve; 
 wherein when said deadhead stop is at the open status, said third end of said third piston valve is connected to said first end of said third piston valve.